AW says:
Prof Pitsiladis described the ways you could theoretically bring Gebrselassie’s marathon best of 2:03:59 down to 1:59:59. “It is no longer a matter of if but rather when,†he said, adding that the barrier could be broken, in his opinion, in five years’ time.
My thoughts. No chance. None (unless you count running down a mountain with a tail wind)